eSoftTools
MBOX Converter Tool
eSoftTools provides a very user-friendly tool for MBOX file conversion that supports MBOX, MBX, MBS, MSF, and SBD files. This software displays a complete preview of email messages within the software without the help of any email clients. The tool gives multiple features, like selective file conversion options, email filtration, and naming convention options.
https://www.esofttools.com/mbox-converter.html